55 2160 McElroy, Tom;Midwinter, Clive;Barton, David;Hall, Bob;Kerr, James;Wardle, David ENVIRONMENT CANADA, Dowsview, Ontario, CANADA M3H 5T4 (416) 739-4630 Brewer Ozone Spectrophotometer data at Barber's Point ( 21.31, 158.07) STRAT 1 1 1995 11 05 1995 11 05 0 14 elapsed time in UT seconds from 0000 hours on the day given in DATE Station name 9 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 99 99 99 999 999 999 999 999 999 hour minute second airmass ozone [DU] (Dobson Units) ozone error [DU] (Dobson Units) SO2 [DU] (Dobson Units) SO2 error [DU] (Dobson Units) Number of data points in row 9 0 1 1 1 1 1 1 1 1 1 99 9999 999 999 99999 999 999 999 999 number of observations instrument number station latitude (degrees) station longitude (degrees) station elevation (m) daily mean O3 [DU] (Dobson Units) daily mean O3 error [DU] (Dobson Units) daily mean SO2 [DU] (Dobson Units) daily mean SO2 error [DU] (Dobson Units) 1 *** preliminary data *** 16 The Brewer Ozone Spectrophotometer is a 15-cm focal-length, modified Ebert-Fastie spectrograph which makes rapid, time-multiplexed measurements in the UV-B region of the solar spectrum. A typical direct sun observation is the average of 5 separate observations. If the standard deviation of the measurements is less than 2 DU, the measurement is taken as acceptable. If the standard deviation is larger, it is interpreted as indicating variability of the solar intensity, i.e.: clouds or other optical attenuation. Each of the five ozone measurements which contributes to the average value are composed of 40 short observation samples. A cycle of 2 samples on each of the five wavelengths takes place in about 1.2 seconds. The usual measurement of 20 cycles takes under 30 seconds. Daily averages are calcluted using all good observations and are reported as the last line in the data table. Barber's Point 24 009 21.31 158.07 0.0 291.0 6.4 -3.3 1.0 67241 18 40 41 2.284 278.1 1.3 -2.0 0.5 5 67754 18 49 14 2.155 280.2 1.0 -2.1 0.2 5 68268 18 57 48 2.043 283.0 1.1 -2.1 0.3 5 69626 19 20 26 1.809 288.0 1.5 -2.9 0.4 5 70044 19 27 24 1.751 288.3 2.8 -2.8 0.7 5 70770 19 39 30 1.662 288.6 1.7 -2.8 0.4 5 71282 19 48 02 1.609 290.0 1.7 -3.2 0.5 5 72007 20 00 07 1.541 292.5 0.8 -3.5 0.3 5 72877 20 14 37 1.473 292.1 1.0 -3.2 0.3 5 73892 20 31 32 1.409 294.1 1.3 -3.7 0.3 5 74403 20 40 03 1.383 294.5 1.3 -3.7 0.4 5 75127 20 52 07 1.349 297.1 1.5 -4.4 0.5 5 76142 21 09 02 1.312 298.6 0.6 -4.6 0.2 5 77749 21 35 49 1.271 297.9 2.0 -4.5 0.5 5 78259 21 44 19 1.263 298.9 1.6 -4.7 0.5 5 80997 22 29 57 1.253 298.8 1.0 -4.6 0.3 5 82263 22 51 03 1.267 296.4 1.2 -4.0 0.3 5 82776 22 59 36 1.276 294.8 2.4 -3.7 0.6 5 83284 23 08 04 1.288 294.2 2.6 -3.7 0.7 5 86142 23 55 42 1.396 291.6 0.9 -3.1 0.2 5 86664 00 04 24 1.425 291.2 4.8 -4.2 1.5 5 89218 00 46 58 1.630 289.0 2.0 -2.2 1.1 5 90631 01 10 31 1.805 284.4 0.7 -1.7 0.3 5 91361 01 22 41 1.920 283.2 2.3 -1.7 0.6 5